Abstract: The present invention provides a communication system for transmitting messages from one or more dispatcher stations to and from one or more stand-alone, two-way pagers via a radio frequency communication channel, namely, the short message service (SMS) of the Global System for Mobile Communications (GSM/GPRS) cellular telephone network. The paging system of the present invention utilizes a communications protocol which allows a dispatcher station and a pager of the paging system to communicate over the GSM/GPRS network in a predetermined manner. When the dispatcher station sends a message to a pager of the present invention, the message may contain steering codes which inform the pager of the manner in which the message is to be treated. For example, if the message is time-critical, the pager is notified by the steering code that a response to the message must be transmitted within a predetermined time integral.

Abstract: The present invention provides a communication system for transmitting messages from one or more dispatcher stations to and from one or more stand-alone, two-way pagers via a radio frequency communication channel, namely, the short message service (SMS) of the Global System for Mobile Communications (GSM/GPRS) cellular telephone network. The paging system of the present invention utilizes a communications protocol which allows a dispatcher station and a pager of the paging system to communicate over the GSM/GPRS network in a predetermined manner. When the dispatcher station sends a message to a pager of the present invention, the message may contain steering codes which inform the pager of the manner in which the message is to be treated. For example, if the message is time-critical, the pager is notified by the steering code that a response to the message must be transmitted within a predetermined time integral.

Abstract: A portable detachable tracking unit for shipping containers which provides communication via satellite with a central server is provided. The tracking unit has an antenna to communicate both with the GPS satellite and a two-way satellite, a computer, a GPS receiver, a satellite transmitter, a modem and an internal power source. The tracking unit can be attached and detached from the shipping container and is can be attached to the locking bars on the doors of the shipping container. The tracking unit may have sensors for determining when it has been tampered with or detached from the shipping container and transmitting that information to the central server. The tracking unit may have a memory capable of receiving and storing geo-fencing information on the specific route to be taken to the destination with the computer being programmed to determine if the tracking unit is outside of the geo-fence or not and communicating that information to the central server.

Abstract: The present invention provides a communication system for transmitting messages from one or more dispatcher stations to and from one or more stand-alone, two-way pagers via a relatively low bit rate radio frequency communication channel, namely, the short message service (SMS) of the Global System for Mobile Communications (GSM/GPRS) cellular telephone network. The paging system of the present invention utilizes a communications protocol which allows a dispatcher station and a pager of the paging system to communicate over the GSM/GPRS network in a predetermined manner. When the dispatcher station sends a message to a pager of the present invention, the message may contain steering codes which inform the pager of the manner in which the message is to be treated. For example, if the message is time-critical, the pager is notified by the steering code that a response to the message must be transmitted within a predetermined time interval.